function PNGHandler() {
	var self = this;

	this.na = navigator.appName.toLowerCase();
	this.nv = navigator.appVersion.toLowerCase();
	this.isIE = this.na.indexOf('internet explorer')+1?1:0;
	this.isWin = this.nv.indexOf('windows')+1?1:0;
	this.isIEMac = (this.isIE&&!this.isWin);
	this.isIEWin = (this.isIE&&this.isWin);
	this.ver = this.isIE?parseFloat(this.nv.split('msie ')[1]):parseFloat(this.nv);
	this.isMac = this.nv.indexOf('mac')+1?1:0;
	this.isOpera = (navigator.userAgent.toLowerCase().indexOf('opera ')+1 || navigator.userAgent.toLowerCase().indexOf('opera/')+1);
	if (this.isOpera) this.isIE = false; // Opera filter catch (which is sneaky, pretending to be IE by default)
	this.filterID = 'DXImageTransform.Microsoft.AlphaImageLoader';
	this.supported = false;
	this.transform = self.doNothing;

	this.filterMethod = function(o) {
		// IE 5.5+ proprietary filter garbage (boo!)
		// Create new element based on old one. Doesn't seem to render properly otherwise (due to filter?)
		// use DOM "currentStyle" method, so rules inherited via CSS are picked up.
		if (o.nodeName != 'IMG') {
			var b = o.currentStyle.backgroundImage.toString(); // parse out background image URL
			o.style.backgroundImage = 'none';
			// Parse out background image URL from currentStyle.
			var i1 = b.indexOf('url("')+5;
			var newSrc = b.substr(i1,b.length-i1-2).replace('.gif','.png'); // find first instance of ") after (", chop from string
			o.style.writingMode = 'lr-tb'; // Has to be applied so filter "has layout" and is displayed. Seriously. Refer to http://msdn.microsoft.com/workshop/author/filter/reference/filters/alphaimageloader.asp?frame=true
			o.style.filter = "progid:"+self.filterID+"(src='"+newSrc+"',sizingMethod='"+(o.className.indexOf('scale')+1?'scale':'crop')+"')";
		} else if (o.nodeName == 'IMG') {
			var newSrc = o.getAttribute('src').replace('.gif','.png');
			// apply filter
			o.src = 'image/none.gif'; // get rid of image
			o.style.filter = "progid:"+self.filterID+"(src='"+newSrc+"',sizingMethod="+(o.className.indexOf('scale')+1?'scale':'crop')+"')";
			o.style.writingMode = 'lr-tb'; // Has to be applied so filter "has layout" and is displayed. Seriously. Refer to http://msdn.microsoft.com/workshop/author/filter/reference/filters/alphaimageloader.asp?frame=true
		}
	}

	this.pngMethod = function(o) {
		// Native transparency support. Easy to implement. (woo!)
		bgImage = this.getBackgroundImage(o);
		if (bgImage) {
			// set background image, replacing .gif
			o.style.backgroundImage = 'url('+bgImage.replace('.gif','.png')+')';
		} else if (o.nodeName == 'IMG') {
			o.src = o.src.replace('.gif','.png');
		} else if (!bgImage) {
			// no background image
		}
	}

	this.getBackgroundImage = function(o) {
		var b, i1; // background-related variables
		var bgUrl = null;
		if (o.nodeName != 'IMG' && !(this.isIE && this.isMac)) { // ie:mac PNG support broken for DIVs with PNG backgrounds
			if (document.defaultView) {
				if (document.defaultView.getComputedStyle) {
					b = document.defaultView.getComputedStyle(o,'').getPropertyValue('background-image');
					i1 = b.indexOf('url(')+4;
					bgUrl = b.substr(i1,b.length-i1-1);
				} else {
					// no computed style
					return false;
				}
			} else {
				// no default view
				return false;
			}
		}
		return bgUrl;
	}

	this.doNothing = function() {}
	
	this.supportTest = function() {
		// ¿ Es un IE 7 ?
		if (this.isIE && this.isWin && this.ver >= 7) {
			self.transform = self.filterMethod;
			return true;
		}

		// ¿Es un firefox antiguo?
		if (!this.isIE && this.ver < 5) {
			self.transform = null;
			return false;
		}

 		// ¿Es un firefox moderno o un IE de mac 5+?	
		if (!this.isIE && this.ver >= 5 || (this.isIE && this.isMac && this.ver >= 5)) {
			self.transform = self.pngMethod;
			return true;
		}
		
		// ¿Es algo desconocido? Entonces es mejor no usar PNG por si acaso
		self.transform = null;
		return false;
	}

	this.init = function() {
		this.supported = this.supportTest();
	}

}

var pngHandler = new PNGHandler();

pngHandler.init();
if (pngHandler.supported) {
	document.cookie='pngsupport=1; path=/; domain=groony.com;';
} else {
	document.cookie='pngsupport=0; path=/; domain=groony.com;';
}